Connecting device



April 13, 1937.

H. V.l D. SCHRECK CONNECTING DEVICE Filed April 3,

Patented Apr. 13, 1937 UNITED STATES PATENT OFFICE A Application April 3, 1.935, Serial No. 14,419

1 Claim.

This invention relates to pumps, compressors or similar apparatus, and more particularly to a connecting device for connecting the pistons of a multi-cylinder machine to the crank shaft.

AOne object of the invention is to prevent each oneof a series of pistons connected to the same crank pin from imparting a side thrust to the associated pistons.

Other objects will be in part obvious and in m part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference numerals re fer to similar parts,

Figure 1 is a longitudinal sectional elevation of a compressing apparatus ,equipped Iwith a connecting device constructed in accordance with the practice of the invention, and

Figure 2 is a transverse view taken through Figure l on the line 2--2. f

2o Referring more particularly to the drawing,

designates, in general, a compressing apparatus comprising a bed plate 2| having a hollow extension 22 which supports, inthe present instance, a compressing element 23.

25 The compressing element 23, and which may be of the double acting type, comprises a cylinder 24 having a compression chamber 25 to accommodate a piston 26. The ends of the cylinder 24 are provided with the usual heads21,

0 and at each end of the (cylinder are inlet valves 23 to control the admission of fluid medium from an inlet chamber 29 to the compression chamber.

Similarly, at each end of the cylinder 24-are discharge valves 30 for controlling communication between the compression chamber 25 and the discharge chamber 3|. The chambers 23 and 3| are located in the cylinder 24, as is customary, and each chamber may be provided with a suitable conduit for communicating, in

the present instance, the inlet chamber 29 with a source' of uid medium and the chamber 3| with a storage receiver (not shown) or a point .if application.

The bed plate 2| serves as va support for an engine '32 whereby the compressor piston 26 isdriven. The engine '-32' is preferably of the four-cycle type and is shown as comprising two cylinders 33 arranged in V-fashion. l 'I'he cylinders rest upon a distance piece 34` seated upon the bed plate 2| and are suitably bored to provide chambers 35 for the accommodation of pistons 86.

The ends of the chambers 35 are sealed by the usual heads 31 containing sparking plugs 38 to initiate ignition of the fuel whereby the pistons 36 are actuated. 'I'he fuel, employed for this purpose, is conveyed to the chambers by a manifold 39 and its admission into the chambers 35 is controlled by poppet valves-40 of a well known type and which are actuated by a cam 5 shaft 4|, as is customary.

The cam shaft is preferably disposed in the' same vertical plane as a crank shaft 42 supported by the bed plate 2|, and a chain 43 trained over sprockets 44 and 45 carried by the lo cam shaft and the crank shaft, respectively, transmits motion to the former for operating the valves 40.- l

In accordance with the practice of the invention, the cylinders 33 and 24 are so disposed that their axes all lie in the same plane. The cylinders are, moreover, arranged substantially radiallywith respect to the crank shaft 42, and the pistons which they contain are so connected that the forces acting against them are substantially directed 'toward one crank pin, designated herein- 46. 'I'he means selected for effecting this mode of connection comprises a rod 41 which may be termed a master rod and is connected directly to the crank pin 46 with one end and pivoted with its other end to a cross-head 48 slidable on guideways 43 in the extension 22.

The aperture 50 in the rod 41 and wherein the crank pin 46 lies opens from the side of the rod 41. A closure is provided for the aperture by a plate 5| having a projection 52 which extends into the aperture 50 and has a surface 53 -which is curved to conform to the curvature of the crank pin 42 and cooperates with a similar surface 54 in the rod 41 to provide a bearing for the crank pin 46. On the rod 41 adjacent the aperture 50 and confronting the pistons 36 are lugs 55-which are suitably spaced with respect to each other to receive therebetween .the ends of connecting rods 56 pivotally connected' 40 with their other ends to the pistons 36. The lugs 55 serve as bearings for pivots or pins 51 which. extend through the connecting rods 56. v`

In practice the present invention has been found to be a highly eiilcient device for preventing the transmission of side thrust from one to another of a plurality of pistons connected to the same crank pin. By interposing a crosshead in the devices connecting one piston, for example, the piston 26, with the crank pin and 50 connecting the remaining pistons pivotally to the rod 41 adjacent the crank pin in the manner described, the. thrust resulting from the power stroke of the pistons 36 will be imparted 10 pressor cylinder having their axes in the sameA plane. pistons in the cylinders, a crank shaft having a crank pin, a cross-head interposed between the crank pin and the piston in the compressor cylinder, a. rod on the cross-head having a side aperture to receive the crank pin, a closure for the aperture extending into the aperture and having a curved surface to seat against the crank pin, and connecting rods for the remaining pistons pivotally connected to the flrst mentioned rod adjacent the bearing.

HENRY v. D. scHRE'cK. 

